ASRock Z270 Pro4 User Manual - Page 24
Expansion Slots (PCI and PCI Express Slots), PCIe Slot Configurations - graphics card
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2.4 Expansion Slots (PCI and PCI Express Slots) There is I PCI slot and 5 PCI Express slots on the motherboard. Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation. PCI slot: The PCI1 is used to install expansion cards that have 32-bit PCI interface. PCIe slots: PCIE1 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE3 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE4 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards. PCIE5 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards. PCIe Slot Configurations Single Graphics Card PCIE2 x16 PCIE4 N/A Two Graphics Cards in CrossFireXTM Mode x16 x4 For a better thermal environment, please connect a chassis fan to the motherboard's chassis fan connector (CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using multiple graphics cards. English 18